Signals and structural features involved in integral membrane protein targeting to the inner nuclear membrane

doi:10.1083/jcb.130.1.15

16th INTERNATIONAL VASCULAR BIOLOGY MEETING

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Signals and structural features involved in integral membrane protein targeting to the inner nuclear membrane

B Soullam and HJ Worman
Department of Medicine, College of Physicians and Surgeons, Columbia University, New York 10032, USA.

We have examined transfected cells by immunofluorescence microscopy to determine the signals and structural features required for the targeting of integral membrane proteins to the inner nuclear membrane. Lamin B receptor (LBR) is a resident protein of the nuclear envelope inner membrane that has a nucleoplasmic, amino-terminal domain and a carboxyl-terminal domain with eight putative transmembrane segments. The amino-terminal domain of LBR can target both a cytosolic protein to the nucleus and a type II integral protein to the inner nuclear membrane. Neither a nuclear localization signal (NLS) of a soluble protein, nor full-length histone H1, can target an integral protein to the inner nuclear membrane although they can target cytosolic proteins to the nucleus. The addition of an NLS to a protein normally located in the inner nuclear membrane, however, does not inhibit its targeting. When the amino-terminal domain of LBR is increased in size from approximately 22.5 to approximately 70 kD, the chimeric protein cannot reach the inner nuclear membrane. The carboxyl-terminal domain of LBR, separated from the amino-terminal domain, also concentrates in the inner nuclear membrane, demonstrating two nonoverlapping targeting signals in this protein. Signals and structural features required for the inner nuclear membrane targeting of proteins are distinct from those involved in targeting soluble polypeptides to the nucleoplasm. The structure of the nucleocytoplasmic domain of an inner nuclear membrane protein also influences targeting, possibly because of size constraints dictated by the lateral channels of the nuclear pore complexes.
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